spring security 获取真实密码 spring security验证登录

1.springsecurity是一个安全管理框架，底层实现为一条过滤器链，就是用户请求进来，判断有没有请求的权限，抛出异常，重定向跳转。

首先引入security的依赖

<!--security-->
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
</dependency>

中间过程中验证请求头中是否存在登录信息（token）

验证登录信息是否正确的业务可以实现UserDetailsService接口重写loadUserByUsername方法

public class UserDetailsServiceImpl implements UserDetailsService {

    @Qualifier("com.zhang.demo.service.GateWayService")
    @Autowired
    private GateWayService gateWayService;

    @Override
    public UserDetails loadUserByUsername(String userName) throws UsernameNotFoundException {

      //进入UserDetailsService过滤链检验登录信息是否为真
        if(null==userName||"".equals(userName)){
            System.err.println(userName);
            throw new RuntimeException("未登录");
        }
        
        User loginUser = null;
        try {
            loginUser = gateWayService.findUserByUserName();
        }catch (Exception e){
            //可抛出异常用于捕获
            System.err.println("报错了");
        }
        //校验是否存在
        if(Objects.isNull(loginUser)){
            System.err.println("用户名或密码错误");
                throw new RuntimeException("用户名或密码错误");
        }
        //通过返回
        return new LoginUser(loginUser);
    }
}

编写SecurityConfig配置类暴露校验接口以及配置跨域和放行请求

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {


 //Result是个人编写的结果集

    @Autowired
    private JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    //暴露
    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }

    //暴露接口用来编码和校验密码
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }


    //放行请求
    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/call/codeImg", "/call/getToken", "/call/findAllBranch", "/user/user/findUserByUserName");
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        //自定以登录页面
        //http.formLogin().loginPage("/login");
        http.headers().cacheControl();// 不要缓存
        http.cors();// 允许跨域
        http.csrf().disable();//关闭csrf
        //匿名访问
        http.authorizeRequests().antMatchers("/call/login", "/call/getToken").anonymous()
                .antMatchers("/**").authenticated()//需要认证
                .and()
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                //不通过session获取securitycontext
                .and()
                .authorizeRequests()
                //初上名外的所有请求全部需要鉴权认证
                .anyRequest().authenticated()
                .and().exceptionHandling().accessDeniedHandler(
                // 没有权限的处理
                new AccessDeniedHandler() {
                    @Override
                    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AccessDeniedException e) throws IOException, ServletException {
                        httpServletResponse.setContentType("application/json");
                        httpServletResponse.setHeader("charatar", "UTF-8");
                        Result result = new Result(500, "您没有该权限");
                        httpServletResponse.getWriter().println(JSONObject.toJSONString(result));
                        httpServletResponse.getWriter().flush();

                    }
                })
                .authenticationEntryPoint(new AuthenticationEntryPoint() {

                    // 没有登录的时候的处理
                    @Override
                    public void commence(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
                        httpServletResponse.setContentType("application/json");
                        httpServletResponse.setHeader("charatar", "UTF-8");
                 
                        Result result = new Result(501, "您尚未登录");
                        httpServletResponse.getWriter().println(JSONObject.toJSONString(result));
                        httpServletResponse.getWriter().flush();
                    }
                });

        //添加jwt的过滤器到校验登录信息的过滤器之前
        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
    }
}

校验请求头中是否携带Jwt生成的登录信息

  如果存在就放行到下一个过滤器进行过滤操作，反之就不通过

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisTemplate redisTemplate;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        String token = httpServletRequest.getHeader("token");
        // System.err.println("token-----"+token);
        // System.err.println(token==null);
        // System.err.println(token);
        //判断请求投中是否有登录信息
        if(token==null||"null".equals(token)||"".equals(token)){
            //放行到下一个内置过滤器
            filterChain.doFilter(httpServletRequest,httpServletResponse);
            //返回到此
            return;
        }

        //此处是对请求头中的token进行解密操作如若不了解可查看博客中的Jwt生成
        DecodedJWT tokenInfo = JwtUtil.getTokenInfo(token);
        //get（）获取存放的时候存放的数据
        String loginUser = tokenInfo.getClaims().get("loginUser").asString();
        User user = JSONObject.parseObject(loginUser, User.class);
        if(!redisTemplate.hasKey("LOGIN_USER"+user.getId())){
            throw new RuntimeException("未登录");
        }
        //存入SecurityContextHolder
        UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(user, null, null);
        SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}

登录接口进行登录成功，把登录信息生成一个Jwt的token以后发送到前端，然后吧这条登录的token保存起来(列vuex,或存储到本地)，之后每次向后端发送请求的时候都要携带这个token，到后台要对这个token进行解析并与缓存、数据库中的数据进行对比判断是否认证或授权。